GSM is the same unit across every product type, but the right number changes depending on what you are making. A 480 GSM t-shirt would be unwearable in warm conditions. A 180 GSM hoodie would feel like a costume, not outerwear. The logic of fabric weight is always about the garment's function, its drape, and the expectation a customer brings to it.
This guide covers the three most common categories: t-shirts, hoodies, and sweatpants. It explains what the numbers mean for each, where the meaningful thresholds sit, and how to use weight as a positioning decision rather than just a spec.
GSM Explained in One Paragraph
GSM stands for grams per square meter. It measures the mass of a fabric per unit of surface area. A higher number means more fibre packed into the same space: a denser, heavier, typically more structured fabric. A lower number means less fibre, a lighter hand, and a drape that tends to flow rather than hold. Neither is categorically better. Each serves different applications.
For a more complete treatment of GSM across products and weights, the full GSM guide covers the topic in depth.
T-Shirts: The GSM Ranges and What They Deliver
The most common GSM range for t-shirts sits between 160 and 220 GSM. These are the weights found in most promotional and fast-fashion tees: light, inexpensive to produce, and available in every blank catalogue.
They have their uses, but they read as commodity. The fabric has minimal body, collars lose shape quickly, and the garment drapes differently on different body types in ways that are hard to control in photography or lookbooks.
At 240 to 280 GSM, a t-shirt begins to feel more substantial. The fabric still drapes, but there is more body behind it. Collar retention improves, and the garment holds its shape better through washing. Brands launching at a mid-market price point can work well here without overcomplicating the cost.
Premium blanks for clothing brands typically sit at 280 GSM and above, with 300 GSM representing the current standard for serious streetwear and contemporary fashion. At this weight, the fabric has a presence that a 180 GSM shirt cannot replicate.
It sits differently on the body, photographs with more shadow and dimension, and communicates quality before a customer even looks at the label. The weight is legible through packaging.
Above 320 GSM, a t-shirt enters very heavy territory. Done well, with a construction that compensates for the added density, the result is substantial rather than stiff. Done poorly, it can feel rigid and uncomfortable in warm conditions. The threshold between 300 and 320 GSM is where most serious brands find their answer.
René Bassett's 300 GSM wholesale t-shirt sits at the upper end of the premium range: 100% ring-spun combed cotton, oversized cut, pre-shrunk.
Hoodies: Where Weight Does the Most Work
Hoodies operate in a different weight category altogether. Anything below 320 GSM will feel thin in the hand and thin on the body. The market for premium hoodies has shifted significantly in recent years: buyers in the streetwear and contemporary fashion segment now expect something that weighs at least 400 GSM before it earns the label heavyweight.
At 320 to 380 GSM, a hoodie is adequate. It serves the function, provides some warmth, and can carry decoration. It will not stop anyone in their tracks. For a brand trying to communicate quality through the product itself, this range creates a ceiling.
At 400 to 450 GSM, you are in the range most brands use when positioning at a mid-to-premium level. The fabric has structure, the shoulders hold their shape, and the hood does not collapse inward when not worn. This is a defensible product for a serious brand.
At 480 GSM and above, the garment becomes a statement piece. A properly constructed 480 GSM hoodie has a weight-in-hand that is immediately legible to anyone who handles it with attention.
The fabric resists pilling, the print surface is stable across decoration methods, and the garment ages in a way that improves it rather than degrading it. This is the weight that customers photograph, share, and describe to other people.
René Bassett's 480 GSM French Terry hoodie sits in this range: 100% cotton, pre-shrunk, developed in-house in Portugal. The same fabric and weight applies across the crewneck and zip hoodie, which means everything in the range photographs and wears with the same register.
Above 500 GSM, the gains diminish for most use cases. A 500 GSM hoodie is heavier, but the practical difference in wear, warmth, or durability is not proportional to the added weight. For a direct comparison of those two weights, the 500 GSM hoodie guide covers the question in detail.
Sweatpants: Different Requirements, Different Logic
Sweatpants operate at the intersection of comfort and structure, and the ideal GSM reflects that balance. Too light and the fabric loses its drape and silhouette, producing a garment that looks casual in the wrong direction. Too heavy and the piece becomes restrictive in movement, creating bulk around the knees and limiting stride.
Most premium sweatpants sit between 380 and 480 GSM. The weight needs to be enough for the fabric to fall cleanly from the waistband and hold the leg shape through movement, without so much mass that it works against the body.
French Terry at 480 GSM, the same construction used in heavier hoodies, works well for sweatpants when the cut is generous enough to allow for the fabric's body. The result is a garment with presence and drape: it looks deliberate even off the body, which matters for product photography and flat lays.
René Bassett's 480 GSM sweatpants use the same French Terry construction as the rest of the range. That consistency means they pair naturally with the hoodie and crewneck in lookbooks, drops, and sets. When all pieces share the same fabric weight and construction, a collection reads as coherent rather than assembled.
Choosing the Right Weight for Your Product
The decision on GSM should follow the decision about what the garment is for and who is buying it. A brand operating at an accessible price point does not need 300 GSM t-shirts to make a viable product. A premium streetwear label has no business positioning at 180 GSM if the product experience is part of the proposition.
Once the positioning is clear, the weight choice becomes a technical confirmation rather than a creative one. For premium blanks, the numbers that recur in serious collections are 300 GSM for jersey products and 480 GSM for French Terry pieces.
Those two specifications cover a complete range and hold together as a coherent set. A customer who buys a t-shirt and a hoodie from the same brand should feel that both were chosen with the same intention.
If you want to assess the weights before committing to a collection, the starter pack is the fastest way to do it.
Frequently Asked Questions
What is a good GSM for a t-shirt?
For premium clothing brands, 280 to 320 GSM is the standard range, with 300 GSM being the most common choice among serious streetwear and contemporary fashion labels. Below 220 GSM, the fabric reads as promotional or fast-fashion. Above 320 GSM, the construction needs to compensate for the added density to avoid stiffness.
What GSM is best for a heavyweight hoodie?
480 GSM is the current benchmark for hoodies positioned as premium or heavyweight. At 400 to 450 GSM, a hoodie is solid but not remarkable. Below 380 GSM, the garment lacks the presence most buyers associate with a serious piece. Above 500 GSM, the added weight delivers diminishing returns in feel and durability.
Is 300 GSM good for a hoodie?
No. 300 GSM is appropriate for jersey t-shirts, but it is too light for a hoodie that needs to read as structured outerwear. A hoodie at 300 GSM will feel thin in the hand and lack the body retention that characterises a quality heavyweight piece. French Terry hoodies are typically constructed at 400 GSM minimum.
What is the difference between GSM for t-shirts and hoodies?
The weight categories are different because the garments serve different functions. T-shirts at 160 to 220 GSM are standard; 300 GSM is premium. Hoodies at 320 to 380 GSM are adequate; 480 GSM is premium. Applying t-shirt GSM logic to a hoodie will produce a garment that underperforms the category expectation.
Does higher GSM mean better quality?
Not automatically. GSM measures weight, not construction quality. A poorly made fabric at 480 GSM is still a poorly made fabric. That said, within a well-constructed product line, higher GSM generally correlates with more fibre, more durability, better structure, and a hand feel that reads as premium. Weight is a meaningful signal, not a guarantee.
What GSM are sweatpants typically made in?
Premium sweatpants are typically produced between 380 and 480 GSM. The weight needs to support clean drape and leg shape without restricting movement. French Terry at 480 GSM is a common construction for brands building coordinated sets, since it matches the weight and feel of heavyweight hoodies.
What fabric construction is best for premium sweatpants?
French Terry is the most common choice for premium sweatpants at serious brands. Its smooth face and looped interior provide structure without stiffness, and at 480 GSM it holds the silhouette well in both movement and photography. It also shares its construction with French Terry hoodies and crewnecks, which makes coordinated sets easier to produce from a single fabric spec.
Can I use the same GSM blank across my whole collection?
Not across different garment categories. A single fabric spec will not perform the same way in a t-shirt and a hoodie because the weight requirements differ. What you can do is use the same fabric construction within a product type: for example, all jersey pieces at 300 GSM and all French Terry pieces at 480 GSM. That creates consistency across the collection without forcing an inappropriate weight onto any single garment.
Related Reading
Fabric Weight by Product: The Right GSM for T-Shirts, Hoodies and Sweatpants
GSM is the same unit across every product type, but the right number changes depending on what you are making. A 480 GSM t-shirt would be unwearable in warm conditions. A 180 GSM hoodie would feel like a costume, not outerwear. The logic of fabric weight is always about the garment's function, its drape, and the expectation a customer brings to it.
This guide covers the three most common categories: t-shirts, hoodies, and sweatpants. It explains what the numbers mean for each, where the meaningful thresholds sit, and how to use weight as a positioning decision rather than just a spec.
GSM Explained in One Paragraph
GSM stands for grams per square meter. It measures the mass of a fabric per unit of surface area. A higher number means more fibre packed into the same space: a denser, heavier, typically more structured fabric. A lower number means less fibre, a lighter hand, and a drape that tends to flow rather than hold. Neither is categorically better. Each serves different applications.
For a more complete treatment of GSM across products and weights, the full GSM guide covers the topic in depth.
T-Shirts: The GSM Ranges and What They Deliver
The most common GSM range for t-shirts sits between 160 and 220 GSM. These are the weights found in most promotional and fast-fashion tees: light, inexpensive to produce, and available in every blank catalogue.
They have their uses, but they read as commodity. The fabric has minimal body, collars lose shape quickly, and the garment drapes differently on different body types in ways that are hard to control in photography or lookbooks.
At 240 to 280 GSM, a t-shirt begins to feel more substantial. The fabric still drapes, but there is more body behind it. Collar retention improves, and the garment holds its shape better through washing. Brands launching at a mid-market price point can work well here without overcomplicating the cost.
Premium blanks for clothing brands typically sit at 280 GSM and above, with 300 GSM representing the current standard for serious streetwear and contemporary fashion. At this weight, the fabric has a presence that a 180 GSM shirt cannot replicate.
It sits differently on the body, photographs with more shadow and dimension, and communicates quality before a customer even looks at the label. The weight is legible through packaging.
Above 320 GSM, a t-shirt enters very heavy territory. Done well, with a construction that compensates for the added density, the result is substantial rather than stiff. Done poorly, it can feel rigid and uncomfortable in warm conditions. The threshold between 300 and 320 GSM is where most serious brands find their answer.
René Bassett's 300 GSM wholesale t-shirt sits at the upper end of the premium range: 100% ring-spun combed cotton, oversized cut, pre-shrunk.
Hoodies: Where Weight Does the Most Work
Hoodies operate in a different weight category altogether. Anything below 320 GSM will feel thin in the hand and thin on the body. The market for premium hoodies has shifted significantly in recent years: buyers in the streetwear and contemporary fashion segment now expect something that weighs at least 400 GSM before it earns the label heavyweight.
At 320 to 380 GSM, a hoodie is adequate. It serves the function, provides some warmth, and can carry decoration. It will not stop anyone in their tracks. For a brand trying to communicate quality through the product itself, this range creates a ceiling.
At 400 to 450 GSM, you are in the range most brands use when positioning at a mid-to-premium level. The fabric has structure, the shoulders hold their shape, and the hood does not collapse inward when not worn. This is a defensible product for a serious brand.
At 480 GSM and above, the garment becomes a statement piece. A properly constructed 480 GSM hoodie has a weight-in-hand that is immediately legible to anyone who handles it with attention.
The fabric resists pilling, the print surface is stable across decoration methods, and the garment ages in a way that improves it rather than degrading it. This is the weight that customers photograph, share, and describe to other people.
René Bassett's 480 GSM French Terry hoodie sits in this range: 100% cotton, pre-shrunk, developed in-house in Portugal. The same fabric and weight applies across the crewneck and zip hoodie, which means everything in the range photographs and wears with the same register.
Above 500 GSM, the gains diminish for most use cases. A 500 GSM hoodie is heavier, but the practical difference in wear, warmth, or durability is not proportional to the added weight. For a direct comparison of those two weights, the 500 GSM hoodie guide covers the question in detail.
Sweatpants: Different Requirements, Different Logic
Sweatpants operate at the intersection of comfort and structure, and the ideal GSM reflects that balance. Too light and the fabric loses its drape and silhouette, producing a garment that looks casual in the wrong direction. Too heavy and the piece becomes restrictive in movement, creating bulk around the knees and limiting stride.
Most premium sweatpants sit between 380 and 480 GSM. The weight needs to be enough for the fabric to fall cleanly from the waistband and hold the leg shape through movement, without so much mass that it works against the body.
French Terry at 480 GSM, the same construction used in heavier hoodies, works well for sweatpants when the cut is generous enough to allow for the fabric's body. The result is a garment with presence and drape: it looks deliberate even off the body, which matters for product photography and flat lays.
René Bassett's 480 GSM sweatpants use the same French Terry construction as the rest of the range. That consistency means they pair naturally with the hoodie and crewneck in lookbooks, drops, and sets. When all pieces share the same fabric weight and construction, a collection reads as coherent rather than assembled.
Choosing the Right Weight for Your Product
The decision on GSM should follow the decision about what the garment is for and who is buying it. A brand operating at an accessible price point does not need 300 GSM t-shirts to make a viable product. A premium streetwear label has no business positioning at 180 GSM if the product experience is part of the proposition.
Once the positioning is clear, the weight choice becomes a technical confirmation rather than a creative one. For premium blanks, the numbers that recur in serious collections are 300 GSM for jersey products and 480 GSM for French Terry pieces.
Those two specifications cover a complete range and hold together as a coherent set. A customer who buys a t-shirt and a hoodie from the same brand should feel that both were chosen with the same intention.
If you want to assess the weights before committing to a collection, the starter pack is the fastest way to do it.
Frequently Asked Questions
What is a good GSM for a t-shirt?
For premium clothing brands, 280 to 320 GSM is the standard range, with 300 GSM being the most common choice among serious streetwear and contemporary fashion labels. Below 220 GSM, the fabric reads as promotional or fast-fashion. Above 320 GSM, the construction needs to compensate for the added density to avoid stiffness.
What GSM is best for a heavyweight hoodie?
480 GSM is the current benchmark for hoodies positioned as premium or heavyweight. At 400 to 450 GSM, a hoodie is solid but not remarkable. Below 380 GSM, the garment lacks the presence most buyers associate with a serious piece. Above 500 GSM, the added weight delivers diminishing returns in feel and durability.
Is 300 GSM good for a hoodie?
No. 300 GSM is appropriate for jersey t-shirts, but it is too light for a hoodie that needs to read as structured outerwear. A hoodie at 300 GSM will feel thin in the hand and lack the body retention that characterises a quality heavyweight piece. French Terry hoodies are typically constructed at 400 GSM minimum.
What is the difference between GSM for t-shirts and hoodies?
The weight categories are different because the garments serve different functions. T-shirts at 160 to 220 GSM are standard; 300 GSM is premium. Hoodies at 320 to 380 GSM are adequate; 480 GSM is premium. Applying t-shirt GSM logic to a hoodie will produce a garment that underperforms the category expectation.
Does higher GSM mean better quality?
Not automatically. GSM measures weight, not construction quality. A poorly made fabric at 480 GSM is still a poorly made fabric. That said, within a well-constructed product line, higher GSM generally correlates with more fibre, more durability, better structure, and a hand feel that reads as premium. Weight is a meaningful signal, not a guarantee.
What GSM are sweatpants typically made in?
Premium sweatpants are typically produced between 380 and 480 GSM. The weight needs to support clean drape and leg shape without restricting movement. French Terry at 480 GSM is a common construction for brands building coordinated sets, since it matches the weight and feel of heavyweight hoodies.
What fabric construction is best for premium sweatpants?
French Terry is the most common choice for premium sweatpants at serious brands. Its smooth face and looped interior provide structure without stiffness, and at 480 GSM it holds the silhouette well in both movement and photography. It also shares its construction with French Terry hoodies and crewnecks, which makes coordinated sets easier to produce from a single fabric spec.
Can I use the same GSM blank across my whole collection?
Not across different garment categories. A single fabric spec will not perform the same way in a t-shirt and a hoodie because the weight requirements differ. What you can do is use the same fabric construction within a product type: for example, all jersey pieces at 300 GSM and all French Terry pieces at 480 GSM. That creates consistency across the collection without forcing an inappropriate weight onto any single garment.
Related Reading
What Does GSM Mean in Clothing? And Why It Matters More Than You Think
480 GSM Hoodie Guide: Why Heavyweight Defines Premium Streetwear
What Is French Terry? The Complete Fabric Guide for Clothing Brands
Ring-Spun vs Open-End Cotton: What the Difference Means for Your Brand
Written by
Ricardo Vieira
Ricardo Vieira is the founder of René Bassett and has worked in the Portuguese textile industry for over 10 years. He grew up close to garment production — his family's company operated in the sector — and developed a technical understanding of fabrics, fabric weights and customisation processes that shapes every product René Bassett brings to market. He writes about everything a clothing brand founder needs to understand about blanks, fabrics and production before launching — or scaling — a brand.